GRE error pptp vpn outbound

when I do a pptp VPN from my network over an ATT router I get this error only on my windows 10 devices (1 desktop and 2 laptops) via WiFi and via Hardline. my 1 win7 desktop has no issues and when I put the win10 devices on a different network (my hotspot) the VPN goes through with no issues. any ideas?

I've already tried disabling the win10 stations local firewall and that did not help.
Burhan HusseiniITAsked:
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Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
What exactly is "this error"?
Burhan HusseiniITAuthor Commented:
Capture.PNGsorry ya its a GRE error here is a screen shot
Does your ATT router have NAT Traversal enabled?
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Burhan HusseiniITAuthor Commented:
not sure where to find and edit that. I have a Pace Pla 5268AC modem
I am not familiar with that router and it's features, but if you are using NAT, then there would need to be a NAT Traversal or VPN passthrough setting.
nociSoftware EngineerCommented:
PPTP is not exactly a secure way to build tunnels.. It's easy but does encryption the wrong way, with a broken Cipher (RC4).
And it was broken theoretical around 20 years ago, and practically about 10 years ago...
And not only that, it will be happy to enumerate usernames & passwords for the host as MSCHAPv2 has been sufficiently broken for about the same time.

So please find a better way.  (GRE is not about encryption either, just transforming addresses).

Try L2TP as a replacement. Or plain IPSEC for site-2-site tunnels.

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